AS1507 Datasheet, PDF (1/17 Pages) ams AG – Dual 256-Tap Digital Potentiometer with SPI Interface and High Endurance EEPROM

AS1507
Data Sheet
Dual 256-Tap Digital Potentiometer with SPI Interface
and High Endurance EEPROM
1 General Description
2 Key Features
The AS1507 is a linear, dual 256-tap digital potentiome-
ter specifically designed to replace discrete/mechanical
potentiometers and is ideal for applications requiring a
low-temperature-coefficient variable resistor.
The device is controlled via a 3-wire SPI-compatible
interface and features an internal EEPROM for storing
wiper positions.
Several device variants are available differentiated by
end-to-end resistance as shown in Table 1 (see also
Ordering Information on page 16).
Table 1. Standard Products
Model
End-to-End Resistance (kΩ)
AS1507-10
10
AS1507-50
50
AS1507-100
100
! High Endurance: EEPROM up to 10M cycles
! High Reliability: EEPROM up to 150 years data
retention @ 85°C
! Wiper Position Retained in EEPROM and loaded at
Power-Up
! 256 Tap Positions
! ±0.5LSB DNL in Voltage Divider Mode
! ±0.5LSB INL in Voltage Divider Mode
! End-to-End Resistance: 10/50/100kΩ
! Low End-to-End Resistance Temperature
Coefficient: 90ppm/ºC
! Low-Power Standby Mode: 100nA
! 5MHz SPI-Compatible Serial Interface
The 3-wire SPI-compatible serial interface allows com-
munication at data rates up to 5MHz. The internal
EEPROM stores the last wiper position for initialization
during power-up.
The devices are available in an TQFN 3x3mm 16-pin
package.
Figure 1. Block Diagram
! Single-Supply Operation: +2.7 to +5.5V
! TQFN 3x3mm 16-pin Package
3 Applications
The device is ideal for mechanical potentiometer
replacement, low-drift programmable gain amplifiers,
audio volume control, LCD contrast control, and low-drift
programmable filters.
1
VDD
16
MUTE
2
SCLK
3
SDIO
4
CSN
SPI
Interface
7
GND
8
8-Bit
Latch
25
256-Position
Decoder
16-Bit
EEPROM
8
8-Bit
Latch
Power-
On
Reset
256-Position ²⁵
Decoder
AS1507
9
READY
15
HIGH A
14
WIPER
13
LOW A
12
HIGH B
11
WIPER
10
LOW B
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